Re: In the belly of the beast (MySQLCon)

Joshua D. Drake wrote:
> On Fri, 18 Apr 2008 14:59:34 -0400
> Alvaro Herrera <alvherre@commandprompt.com> wrote:
>
>> I find it pretty unlikely that Slony would be unable to help you
>> upgrade here.  Obviously you can upgrade one database at a time.
>>
>> Also, mostly it's not the database size what's a concern, but rather
>> the size of the largest table.
>
> As I recall (I could be wrong) Slony syncs the whole set as a single
> transaction. So if he has his entire database as a set he may
> have a problem regardless of the largest or smallest table. I would also
> agree that 30 million rows is likely not a problem but he should still
> check his velocity.

We have actually replicated all 13 databases and there was no apparent
impact on production.  This was in the evening, but we are a 24/7 shop.

I'm really not altogether sure what you mean by transaction velocity.
I'm pretty sure the electrons are traveling pretty close to the speed of
light. ;)

--
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin